The surest way to avoid mosquito borne diseases like West Nile Virus and Yellow Fever, is to use a trap such as the mosquito magnet defender to rid your home and yard of mosquito swarms.  The mosquito magnet defender is the largest of the Mosquito Magnet line of traps, with coverage area of up to 1/2 acre.

The mosquito magnet defender is run on a low 12-volt electric power line to power the trap, while the propane tank is used to create carbon dioxide.  The way the trap works is that it uses CO2 and attractants to lure the mosquitoes towards the unit, and then it sucks the mosquitoes into a trap where they will die.  The net is easy to empty.

When you purchase a mosquito magnet defender, be sure to get all the accessories you will need.  The propane tank does not come included, and special added mosquito attractants like octenol are additional.  Other accessories you might need after use are replacement nets, propane tank covers, and CO2 cartridges.  You can also purchase reconditioned traps if you do not want to spend a lot of money on a brand new unit.